Described in the journal Science in June 2018, the now-extinct gibbon Junzi imperialis is not only the newest species and genus of ape discovered, but also the first known ape to have been driven extinct as a result of human activity (aka an "anthropogenic" extinction). Suspected causes include deforestation, hunting and the pet trade. The gibbon's remains were part of an animal menagerie excavated in 2004 from a 2,200–2,300-year-old tomb located near the former royal capital of Xi'an in Shaanxi Province, China. It's estimated that this species may have died out during the 18th century.This study was a collaboration between the ZSL’s Institute of Zoology;University College London;the University of Southampton (all UK);Arizona State University (USA);and the Shaanxi Provincial Institute of Archaeology (China), led by ZSL’s Professor Samuel Turvey.